exam Maths Puzzle Numerical Ability

3[9-(6-3)]-10

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exam Other Question

I need help please!!
I need to evaluate the expressions - nth roots and rational exponents - don't understand - hope I type these right

343^-1/3
729^5/6
(-512)^-2/3
1^5/7
1 Hello friends. I need some more help :(
Solve using substitution

4x - 12y = 5
-x + 3y = -1
Thanks